Pwm Carrier Frequency (Pr. 72, Pr. 240) - Mitsubishi Electric FR-A500 Instruction Manual

4.2.29 PWM carrier frequency (Pr. 72, Pr. 240)

Pr. 72 "PWM frequency selection"
Pr. 240 "Soft-PWM setting"
You can change the motor tone.
• By parameter setting, you can select Soft-PWM control which changes the motor tone.
• Soft-PWM control changes motor noise from a metallic tone into an unoffending complex tone.
Parameter Factory Setting Setting Range
72 2
240 1
<Setting>
• Refer to the following list and set the parameters:
Parameter
Pr. 72 Setting
Number
72 0 to 15
0
240
1
Note: 1. A reduced PWM carrier frequency will decrease inverter-generated noise and leakage current but
increase motor noise.
2. Performing continuous operation at 75% or more of the rated current may automatically decrease
carrier frequency even high carrier frequency is set and generate motor noise according to the
carrier frequency, but it is not a failure.
0 to 15 0: 0.7kHz, 15: 14.5kHz
0, 1 1: Soft-PWM valid
PWM carrier frequency can be changed.
The setting displayed is in [kHz]. Note that 0 indicates 0.7kHz and 15 indicates 14.5kHz.
Soft-PWM Invalid
When any of "0 to 5" is set in Pr. 72, Soft-PWM is made valid.
104
Remarks
Description
PARAMETERS